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Finding the Fourth Proportional to 259,856.80, 389,786.16 and 79,940.98

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Solution

The fourth proportional to 259,856.80, 389,786.16 and 79,940.98 is: 119,911.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    259,856.80 : 389,786.16 = 79,940.98 : x
  2. Step 2: Convert to fraction form
    259,856.80/389,786.16 = 79,940.98/x
  3. Step 3: Cross multiply
    259,856.80x = 389,786.16 × 79,940.98
  4. Step 4: Simplify right side
    259,856.80x = 31,159,887,620.84
  5. Step 5: Solve for x
    x = 31,159,887,620.84/259,856.80
  6. Step 6: Final answer
    x = 119,911.77

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.